SU78630A1 - Device for automatic control and sorting of products - Google Patents

Description

A device is proposed for automatic control and sorting of products, based on a compensation measurement scheme, and, moreover, the 1 Production is sent in a non-contact manner.

The device consists of an inductive electric meter of differential action, the windings of which are included in two adjacent temporary current bridge.

A distinctive feature of the device is the transfer of the two jet coils with magnetisation included in the bridge bridges, the magnetizing windings of which are designed to be inserted into the bridge diagonal through an appropriate amplifier in order to automatically compensate the bridge by changing the inductive salinity of its shoulders.

In addition, each choke is equipped with several separate ones. magnetic windings,. connected one after the other by the help of the relay or trigger system, alternately triggered before bridge compensation, the purpose of determining the deviation of the measured dimensions from the normal by the total number of triggered relays.

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On the fit. 1 and 2 are schematic diagrams explaining the essence of the proposed device.

A bridge with an inductive sensor (LK, and LK-, coils) includes an inductance comparing - magnetizing throttles / A and A. The LI and Lni The middle core of each of these chokes has two windings, Wo and Wi. The windings Wo are wrapped around an additional constant current / const in order to establish a defined operating point on the characteristic of the magnetic amplifier; through the windings Wi, a compensating tokD / flows, obtained after amplification in the amplifier V and phased detection using a detector 2 {voltage of the diagonal of the measuring bridge). The total dc current in the Ini coil will be equal to: and in the packing 1 г g will be equal.

At the equilibrium position, the compensating current D / is the greater, the greater the difference between the size of the product HcnbiTj ejMoiPO and the nominal size at which the bridge is in balance, and the direction of the current corresponds to the change in this difference. When the size of the product is smaller

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nominal current will flow in one direction, and with more - in the other. Therefore, a milliammeter 3 in the output circuit can be calibrated by the size deviation.

The same principle can be applied for the purpose of multi-band automatic sorting by size (Fig. 2). In this case, each of the bias chokes can be supplied, in addition to the WQ winding, with the windings U / ,,, U / ,,. . . W on the middle rod. Each of these windings is either switched by a group of relays, or is connected to the anode circuit of one of the three flip-flops 7, 8.. . Sfn. After switching on the device, the triggers are triggered one by one, and the time interval between triggers triggers is Vso sec. This is achieved, firstly, by applying a pulse to the grids of triggers from peak transformer 5 through diode 6 and, secondly, by blocking the triggers with a known circuit so that the second trigger can work only when the first trigger has already been triggered. etc.

While the bridge is in the “until balance” position, one after the other triggers 7, 5 ... 9 "are triggered and a corresponding change is made to compare the speeds of BV, where

Trigger trigger after trigger.

Due to the small time constant of the trigger output circuit, we can assume that the process in it is established one period before the appearance of the next pulse. When the comparing amplitude turns become such that the bridge passes through the balance position, a trigger 4 is triggered, powered by a bridge unbalanced phased amplifier. When trigger 4 is triggered from the grid of all triggers, a negative bias is applied and new triggers Zj, i are applied. . . „1 can no longer work. However, the triggering triggers 7, .... 9, remain in their position. According to the number of lit neon bulbs in the anode circuits of the 7, 8, 9, 9 triggers, one can judge the type number of the part.

The whole sorting process, for example, into 10 varieties, takes place over 10 periods and does not require any contacts. Since the scheme is compensatory, its accuracy is quite high.

Subject invention

Claims (2)

1. A device for automatic control and sorting of products by size by means of an inductive electrical differential meter, the windings of which are included in the two adjacent arms of the AC bridge, characterized by the use of two reactive biasing coils included in the same shoulder of the bridge, the magnetizing windings of which are intended to include bridge throttles through an appropriate amplifier in order to automatically compensate for the bridge by changing the -inductive resistance nor his shoulders. 2. The form of the device according to claim 1, characterized in that each choke is equipped with several separate magnetizing windings connected one after the other using a relay system or triggers alternately triggered before the bridge compensates to determine the deviation of the measured dimensions from the normal by the total number of triggered relays. FIG. one FIG. 2 jL Kjwrt  9 n. it-j